Java实力弹弹球实现代码

先看看效果图：

直接上代码了。
微调按钮加画布画几个圆，再实现监听。。。

package cn.hncu.threaddemo.thread2;

import java.awt.canvas;
import java.awt.color;
import java.awt.graphics;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.focusevent;
import java.awt.event.focuslistener;

import javax.swing.jframe;
import javax.swing.jlabel;
import javax.swing.jpanel;
import javax.swing.jspinner;
import javax.swing.timer;
import javax.swing.event.changeevent;
import javax.swing.event.changelistener;

public class ballsjframe extends jframe implements changelistener{
  private ballscanvas ball;
  private jspinner spinner;

  public ballsjframe(){
    super("弹弹球");
    this.setbounds(300, 200, 400, 300);
    this.setdefaultcloseoperation(exit_on_close);
    color colors[] = {color.red,color.green,color.blue,color.magenta,color.cyan};

    ball = new ballscanvas(colors,100);
    this.getcontentpane().add(ball);//默认是center位置

    jpanel panel = new jpanel();
    this.getcontentpane().add(panel,"south");
    panel.add(new jlabel("delay"));
    spinner = new jspinner();
    spinner.setvalue(100);

    panel.add(spinner);

    spinner.addchangelistener(this);

    this.setvisible(true);
  }
  @override
  public void statechanged(changeevent e) {
    int value = integer.parseint(""+spinner.getvalue());
    ball.setdelay(value);
  }


  public static void main(string[] args) {
    new ballsjframe();
  }

}

class ballscanvas extends canvas implements actionlistener, focuslistener{
  private ball balls[];//存放所有的球
  private timer timer;//javax.swing.timer

  public ballscanvas(color colors[] ,int delay){
    this.balls = new ball[colors.length];
    for(int i=0,x=40;i<colors.length;i++,x+=20){
      this.balls[i] = new ball(x,x,colors[i]);

    }

    //让当前画布监听 焦点事件
    this.addfocuslistener(this);


    timer = new timer(delay,this);
    timer.start();

  }

  public void setdelay(int delay){
    timer.setdelay(delay);
  }


  @override
  public void paint(graphics g) {
    for(int i=0;i<this.balls.length;i++){
      g.setcolor(balls[i].color);


      //让每个球的坐标变化一下---（x坐标）
      balls[i].x = balls[i].left ? balls[i].x-10:balls[i].x+10;
      //当球碰壁时，更改球的方向
      if(balls[i].x<=0||balls[i].x>=this.getwidth()-24){
        balls[i].left = !balls[i].left;//切换方向
      }

      //让每个球的坐标变化一下---（y坐标）
      balls[i].y = balls[i].up ? balls[i].y-10:balls[i].y+10;
      //当球碰壁时，更改球的方向
      if(balls[i].y<=0||balls[i].y>=this.getheight()-22){
        balls[i].up = !balls[i].up;//切换方向
      }



      g.filloval(balls[i].x, balls[i].y, 20, 20);
    }
  }


  @override
  public void actionperformed(actionevent e) {
    //system.out.println("aaa");
    repaint();//刷新画布.调用paint(graphics g)
  }



  @override
  public void focusgained(focusevent e) {
    timer.stop();
  }

  @override
  public void focuslost(focusevent e) {
    timer.restart();

  }




  private static class ball{
    int x,y;
    boolean up,left;
    color color;
    public ball(int x, int y, color color) {
      this.x = x;
      this.y = y;
      this.color = color;
      up = left = false;
    }

  }




}

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